Steam boiler



1 I... D. COPELAND STEAM BOILER Filed July 5, 1923 4 001/5 0. COPE/W0 Afzorney.

Patented Aug. 30, 1927. I v i UNITED STATES PATENT; OFFICE,

tUoIUsn. COPELAND, or LOS'ANGELES; CALIFORNIA.

STEAM; BOILER. Application filed 31113715, 1923. Serial No. 649,430. 7

This invention relates to steam boilers and of the tube 20. The two beveled surfacesv 1 particularly to boilers which are adapted for which may be ground; afford a steamtiuh use in steam automobiles. I V I j int. The upper end of'the holdin tube 21 The general object of the inventionisto is preferably threaded as at 23 iind'this 60 5 provide a steam boiler or-generator, which threaded portion is engaged a -cap 25'.

is highly eificient, and which will be effective Thisocap is preferably provided with a lower for a long period of time. p 1 f beveled surface 26 which may coact with the I 7 One of the specific ob 'ects of the invention similar surface on the closure portion-:

is to provide a steam boiler'of the drop water I From the foregoing description .it will 65 10 tube type wherein parts of the boiler'may. be apparent that thedrop water tubes be removed to allow them to be cleaned. may be easily removed from the boiler by A further object of the invention is to, loosening the holding nut and withdrawprovide a removable circulation tube for ing the tube 20 from the boiler casing. I steam boilers. v In order to provide for proper circula- 15 An additional objectof the invention is tionof water through the drop water tube to provide a boiler of the drop tube type I show a circulation tube 30. This circula with means for increasing the heating area tion tube comprises a hollow member which in contact with the products of combustion. extends to a. point adjacent the bottom 31 Another object of the invention is to pro-' of the tube 20 and is provided: with one or vide a novel form of spring for holding the more apertures 32 adjacent the lower end. circulation tube of asteam boiler in position. The upperportion of tube 30 is shown as i An additional object of the invention is provided with a flange 33 which is disposed. to provide a drop water tube bo'iler having adjacent t-heinner wall of the tube 21 V a holding tube united to the dropfltube in The holdingtube 21 is shown as provided 25 such a manner that the two tubes can be rewith a plurality of apertures, the top apermoved as a unit turesbeing indicated at 35, the intermediate Further objects of the invention will be apertures at 36, n the lower apertures at apparent from the following description 37. The apertures 35 and 36 serve to furnish taken in connection with the accompanying means whereby the water may enter the cir 30 drawings wherein Fig. 1- is a perspective. culation tube 30 whence it passes downward i f a b il b dying th f atures of in this tube and out through the apertures my invention; Fig. 2 is a sectional view,- 32. Water passing from theaperture 32 is partly in elevation,- showing the boiler tubes at once. heated as it comes in contact with and fines; Fig. 3is' a section on line 3 -3, the tube 20 and this water rises in the space.

5 Fig. 2; and Fig. 4: is a section on line-H, between the tube 30 and the inner wall of the i 2 v 1 tube 20, and passes out of the apertures 37 Referring to the drawing by reference 1n the tube 21. :v characters, I have shown a boiler embodying T c r ul on be .30 is loosely l posith f t s f my i v nti n at 10 This tioned within the drop water tube 20and in 40 boiler is indicated as comprising a shell 11 order to maintain it in propervp i n I may having top and bottom portions 15 and 14C. provide aspr1ng 40 here shown as a leaf 'th' an i 1 t16 spring having a lower curved portion 41 for The boiler is also provided w1 and with an outlet 17. r I engaging the end of'the circulation tube.

The boiler shown is preferably of the drop The other end of the spring 10 is preferably 45 tube type and as indicated, the shellll is engaged by the cap 25. I 7

provided, with a plurality of depending From the foregoing description itwill be =11 water tubes 20. Each of the water tubes 20 apparent that the drop water tube 20 and the is shown as provided at its upper end with a holding tube 21 constitute in eflect a single holding tube 21. This holding tubeis prefunitary member. and that" they may be re-.- erably brazed as at-22' to the dropwater tube moved; repaired, and replaced whi1'e inthis; 20 or-the parts may be united in "any other unitary condition; a. w desired manner. 1 I have shown in Fig." 1' at 50a heating It will be notedthat the holding tube 21 element for raising the temperature of the; extends entirely 55 that the closure 14 0f the shell 11 is beveled .50 which may be anoil burner is intendedto to match a corresponding bevel on the topv be merely illustrative of any one of anumber through the shell 11 and water in the boiler; Thisheating element 11 ing through the shell 11.

the water tubes in contact with the fire. I

am aware that previous to my present invention fins have been used upon the exterior surface of the drop water tube in order to increase the heating area. These fins-have p'roven objectionable, however, in that they require considerable room and, moreover, the distance of the front edge of the fin from the tube is such that the de sired conduction of heat is not secured.

To overcome the difliculty just mentioned, I provide a plurality of fire tubes 55. These tubes which may vary in number, as desired, are illustrated in Fig. 4:, as arranged upon the surface of the tube 20. The flues or tubes are preferably united to the drop water tube 20 by brazing as at 56. This operation causes a considerable amount of metal to be disposed between the joined pipes and this relatively large amount of metal aids in conducting the heat from the tubes 55 to the central tube 20. It is a well known fact that metal is a good conductor of heat and it will be readily apparent that the gases passing about the fire tubes 55 and within these tubes will raise the temperature of the metal of which the tube is composed and this heat conducted through the tubes 55 to the tube 20 raisesthe temperature of the latter tube and causes more steam to be generated.

I now prefer to make the drop tubes 20 as Well as the fire tubes 55, of copper while the boiler shell and the holding tube 21 may be of steel or other material if desired.

Suitable fire tubes are shown as pass- The ends of these tubes 60 may be flanged or upset against the ends of the shell 11.- Having thus describedmy invention, I claim:

1. In a boiler, a shell having a plurality of water tubes and a plurality of fire tubes extending therethrough, with a setof fire tubes about each water tube, a drop tube extending from each of said water tubes and spaced from one another, said drop tubes having members constituting fire tubes fixed- 1y secured to the exterior surfaces thereof,

said first mentioned fire tubes and said second fire tubes having their axes arranged parallel.

2. In a boiler, a shell having a drop tube secured thereto and in communication with the interior thereof, a plurality of flues secured to and spaced about the periphery of the drop tube, a holding tube in said casing coaxially arranged with respect to said drop tube and extending from the top to the bot- 1 tom of said shell, said holding tube and said drop tube being secured together to COIlSti? tute a continuous tube and means whereby said continuous tube may be readily removed from said shell.

3. In a boiler, a shell having a drop tube secured thereto and in communication with the-interior thereof, a plurality of fire tubes in the shell spaced about said drop tube, a holding tube in'the shell coaxially arranged with respect to the drop tube, said holding tube being fixedly united to the .drop tube, means to provide a steam tight joint between the drop tube and the boiler. shell and a closure member for engaging saidholding tube to hold the same in the shell and also to prevent leakage between the shell and'the holding tube. r

4. In a boiler, a shell having a drop tube secured thereto and in communication with the interior thereof, a holding tube arranged within the shell and having its lower extremity united to the drop tube, means for removably maintaining the holding tube in steam tight engagement with the shell, a plurality of flues secured to the periphery of said drop tube and means in saiddrop tube to cause a circulation'ofwater therethrough.

5. In a boiler, a shell having a drop tube secured thereto and in communication with tending from the top to the bottom of. said' shell, said holding tube and said drop tube being secured together, to constitute a uni tary structure, a circulation tube in said drop tube, a flange on the top of said circulation tube arranged adjacent the interior wall of said holding ,tube, an apertureadjacent the bottom of said circulation tube, -a spring for holding said circulation tube in place, a cap for closing said holding tube, said cap serving to hold the drop tube in the shell fire. tubes passing through the shell and. fines arranged upon the drop tube. I 7". In a boiler, a shell'having a drop tube secured thereto and in communication with the interior thereof, means to hold said drop tube in said shell, a; readily removable water circulation tube in said drop tube, and a spring for holding the circulation tube in place in said droptube. V

In testimony whereof, I hereunto affix my signature. I

. Lucius n. 'ooPELAND. 

